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The physics of blackbodies has been an ongoing source of fascination and scientific research for over a hundred years. Kirchhoff's law states that emissivity and absorp-tivity are equal for an object in thermal equilibrium. Coupled with the Second Law of Thermodynamics, one can show that no object can emit more than a blackbody at any given frequency, direction or polarization. While this provides a theoretical maximum to the intensity of thermal emission from an object, few come even close to the level of emission exhibited by a blackbody. Thus, there is much room for research into enhancing thermal radiation from many different types of materials. The ability to modify or tailor the thermal emission profile of an object is of great importance and interest in many areas of applied physics and engineering. It turns out that thermal emission spectra can be changed by altering the geometry of the system or the materials used. For instance, nanoscale patterning can enhance emission at certain frequencies, while point defects can localize light at microcavities. General periodic electromagnetic structures, also known as photonic crystals, ar